abrasion resistant chromium carbide welded overlay for piping products
INDULAY is an internal chromium carbide weld overlay process designed to combat abrasion in piping systems used for the conveyance of bulk materials.
INDULAY is cost-effective where there is severe pipe abrasion. Actual performance is dependent on the overlay thickness and the system’s operating conditions. Field results have shown INDULAY to have a wear-life of 8 to 20 times that obtained from regular carbon steel.
INDULAY is a unique process that gives a smooth continuous overlay on a one-piece pipe bend. It eliminates the need for bends of segmented construction. Integral tangents can be overlayed in the same continuous manner.
INDULAY can overlay pipe bends of any angle of any radius from 1D to 20D and to any angle up to 90 degrees provided that the arc length does not exceed 16 ft (4.9 meters). Minimum pipe diameter is 3″ (76.2mm), maximum 48″ (1219mm).
INDULAY can be applied to straight pipe, tees, and reducers. Minimum diameter 3″ (76.2mm), maximum length 20ft (6m).
INDULAY spools, if specified, can conform to ASME B31.3 and B31.11.
INDULAY Bend Repair
Worn bends or fittings of weldable alloy can be patched when work through and overlayed to bring them back to their original condition.
INDULAY has been developed to give maximum abrasion resistance through the chrome carbide layer. This has been achieved by the development of specialized welding techniques which gives an even dispersion of carbides across the chrome carbide layer and the minimum of dilution between the steel pipe and the chrome carbide overlay.
Hardness across the undiluted carbide overlay is in the range of: 575 BHN (56 HRC) to 720 BHN (64 HRC).
INDULAY Overlay Options
The INDULAY welding process is open arc flux core. Overlay thickness is from 3/16″ (5mm) to 9/16″ (14mm). The overlay can be placed in areas of high wear to maximize life.
Single Pass 190°
or Double Pass 190°
or Double Pass 190°
Single Pass
360°
360°
Double Pass – One pass 360° Inner pass 190°
Double Pass –
Both 360°
Both 360°
INDULAY Alloys
Type G – For severe abrasion, moderate impact, and temperatures up to 900° F (482° C)
Type H – For temperatures up to 1700° F (925° C) which is used in conjunction with a stainless steel backing pipe.
Alloys for extreme service conditions can be applied to suit customer’s requirements
INDULAY Weld Chemical Composition
| Type G | Type H | |
|---|---|---|
| Carbon | 6%-7% | 1.5%-2.5% |
| Manganese | .75%-1.1% | 1.2%-1.7% |
| Silicon | .1%-.35% | .75%-1.1% |
| Chrome | 24%-27% | 26%-29% |
| Iron | Balance | 3%-5% |
| CO | – | Balance |
End Preparation for Welded Overlay Pipe
INDULAY pipe bends and fabrications can be fitted with standard ASTM flanges and coupling rings
Weld-Neck Flange
Slip-on Flange
Victaulic® Ring
Transition from nominal pipe size to Chrome Carbide Overlay
